Method of embossed printing.



F. LAMEY.

METHOD OF EMBOSSED PRINTING.

APPLICATION FILED Ammo, 1914.

Patented. Nov. 3, 1914.

FRITZ LAMEY, 0F MU'LHAUSEN, GERMANY.

METHOD OF EMBOSSED PRINTING.

Specification of Letters Patent.

Patented NOV. 3, 1914.

Application filed April 20. 1914. Serial No. 838.173.

'1 '0 all 007mm 1' 27 may concern Be it known that I, Fnrrz Lamar. asubject of the Emperor of Germany, residing at 9 Spiegelvorstadtstrasse,Miilhausen, Alsace, Germany, have invented certain new and usefulImprovements in Methods of Embossed Printing; and I do hereby declarethe following to be a full, clear, and exact description of theinvention.

In known methods of embossed printing, whether in relief or in intaglio,the paper is previously moistened by the application of either water orsteam. hen two or more colors are used in the printing it is in mostcases necessary to allow the paper to dry between the different colorimpressions, in order to prevent the off-set of the first printed coloronto the printing mechanism of the next following color. The drying ofthe color impression has been accomplished by means of a stream of coldand dry air, or

by means of a highly heated current or jet of air directed upon thesheet of paper as it passes from one color set to another, in

the press. By reason of this drying the paper shrinks unevenly anddraws, so that it is very difficult or impossible to maintain theregister of the colors or partial designs with respect to one another.

The present invention makes use of the customary drying of the ink orimpression l')t\-'\C8I1 different successive color impressions, and inaddition thereto maintains the paper as moist as possible, and aspliable as possible. ThisI accomplish by cooling the back of the sheetor web of paper only. This may be done by applying moisture to the backonly, while the face of the sheet or web of paper carrying theimpression is dried by a drying current of air, which may be either hotor cold. This current of air thus dries the color, but not the body ofthe paper. The cooling of the back of the sheet or web may beaccomplished in many ways, depending upon the structure of the pressbeing used. If the paper does not travel over intermediate carrying orguide rolls between the impression cylinders, then the cylindricalplaten is cooled by a suitable medium, cold water, cold air, or otherwell known media, to a low temperature. This temperature will dependupon the number of color impressions to be given the web or sheet,somewhat upon the atmospheric conditions, temperature of the work-room,com position of the ink, &c.

. cylinder.

But I havefonnd that when working with two color impressions a lowtemperature is suitable. If intermediate carrying or guide rolls arepresent on the press which prevent the sheet or web from contacting witha material portion of the platen cylinder, the desired cooling ormoistening is accomplished by blowing onto the back of the sheet or weba ciurrent of cold moist, or damp air, or 'wet or primed steam, oratomized or nebulized water, or the surfaces of the guide rollsthemselves (which contact only With the back of the paper) may bemoistened, and thus carry the moisture to the paper as it passes overthem. The fundamental idea is to prevent the paper from drying out,while drying the im ression thereon sufficiently to prevent its 0 set onthe next following impression cylinder.

In the drawing Figure l is a side View, and Fig. 2 is an end view of awell known type of press adapted to carrying out my invention, and inwhich I llZtWEb illustrated two sets of color trains and theirpertaining impression cylinders and platens, indicated by A, B. On theleft side of the Fig. 1 there is represented one form of the coolingdevice according to my invention different from that on the right sideof Fig. 1 for the next following impression. In the first case I use anintermediate pressing roll I; the surface of which may be moistened byblowing onto the same a current of atomized water, carrying the moistureto the back of the sheet as it passes over the impression In the othercase, if no intermediate guide or pressing roll is employed, theplaten-cylinder c is cooled by cold water jets issuing from a perforatedpipe d, which is supplied with the cooling medium by the pipe 6,connected with the main supply pipe 6; This main pipe 6 also feedsthrough the pipe 6 the intermediate pressing roll I), if any, andfurthermore the cooling cylinders f and g by the pipes 6 and e,, whichcylinders are arranged according to my invention to further cool theback of the sheet .9 or web between the one color impression and thenext following color impression. Each of the pipes e, and e, areperforated at their the impression.

passed the cooling cylinder f the drying device k, blowing onto theprinted s1de of the paper a stream of hot air, and drying the colorimpression, without totally drying out the paper. To increase the degreeof moisture the sheet may be once more moistened by blowing some wateronto the back of the paper by means of a further spraying device 5 forsupplying with atomized water or damp steam by the pipe 6 The number ofthe cooling devices depends upon the structure of the paper and othercircumstances as above mentioned.

I claim as my invention:

1. The method of multi-color printing, which comprises drying animpression sufficiently to prevent its off-set at the followingimpression, while maintaining the moisture content in the papersufiicient to prevent the distortion or drawing of the paper whichdestroys the register of the impres: slons.

2. The method of multi-color printing, which comprises drying animpression sufficiently to prevent its off-set at the followingimpression, while maintaining the moisture content in the paper bycooling sufficient to prevent the distortion or drawing of the paperwhich destroys the register of 3. The -method of multi-Tcolor printing,which comprises drying an impression sufficiently-to prevent its olf-setat the next following impression, while cooling the back of the sheet orweb to maintain a sufiicient content of moisture therein.

4. The imethod of multi-color printin which comprises drying animpression su ficiently to prevent its olf-set at the next followingimpression, while cooling the back of the sheet or web by moistening thesame With water to prevent distortion or drawing of the paper.

5. The method of multi-color printing, which comprises drying animpression sufficiently to prevent its off-set at the next followingimpression, while cooling the back of the sheet or Web by moistening thesame with water in a finely divided condition,

to maintain a suflicient content of moisture therein. I

6. The method of multi-color printing, which comprises drying animpression sufficiently to prevent its off-set at the next f0l-' lowingimpression, while cooling the back of the sheet or web by moistening thesame with an atomized or neutralized spray of water to maintain asufficient content of moisture therein.

In testimony whereof I have name to this specification,

of two subscribing witnesses.

- FRITZ LAMEY.

signed my Witnesses WOLDEMAR HAUPT, RICHARD GoETz.

in the presence

